Patent US3459277A successfully refreshed from Google Patents.
US3459277A
Expired / Lapsed
US
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Ladder jacks
Assignee: EZRA F FREDERICK
•
Filing: 1967-12-11
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Granted: 1969-08-05
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Expires: 1987-12-11
Abstract
No abstract record available.
Inventors
- 👤 Ezra F Frederick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:35
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/48
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1004284A
Cited
US1187437A
Cited
US2592006A
Cited
US2720354A
Cited
US3072218A
Cited
US3288249A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-08-04 | 1973-02-03 | 1973-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-04 | 1977-02-03 | 1977-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-04 | 1981-02-03 | 1981-08-05 | $7700.00 | Window Closed / Lapsed |